/ Dictionary / Index L leucosis: Meaning and Definition of Find definitions for: leu•co•sis Pronunciation: (l-kō'sis), [key] — n. Vet. Pathol. leukosis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. leucopoiesis Leucothea Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language